Set data Type in Vue data object with Typescript

I'm currently using Vue.js with Typescript in a webpack project. As indicated in the Recommended Configuration in my tsconfig.json I have: "strict": true, Inside one of my component i have: declare interface Player { cod: string, param: string } export default Vue.extend({ name: 'basecomponent', data() { return { players: [] }; }, created() let self = this axios.get('fetch-data') .then((response)